<style>
  p{
    color:white;
    width:120px;
    height:36px;
    line-height:36px;
    background:#07c160;
    font-size:14px;
    border-radius:4px;
    text-align:center;
  }
  p:hover{
    background:#06ad56;
  }
</style>
<p>登录</p>